<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
 <head>
  <meta http-equiv="content-type" content="text/html; charset=UTF-8">
  <title>Truncate stream</title>
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-base.css" />
<link media="all" rel="stylesheet" type="text/css" href="styles/03e73060321a0a848018724a6c83de7f-theme-medium.css" />

 </head>
 <body class="docs"><div class="navbar navbar-fixed-top">
  <div class="navbar-inner clearfix">
    <ul class="nav" style="width: 100%">
      <li style="float: left;"><a href="streamwrapper.stream-tell.html">« streamWrapper::stream_tell</a></li>
      <li style="float: right;"><a href="streamwrapper.stream-write.html">streamWrapper::stream_write »</a></li>
    </ul>
  </div>
</div>
<div id="breadcrumbs" class="clearfix">
  <ul class="breadcrumbs-container">
    <li><a href="index.html">PHP Manual</a></li>
    <li><a href="class.streamwrapper.html">streamWrapper</a></li>
    <li>Truncate stream</li>
  </ul>
</div>
<div id="layout">
  <div id="layout-content"><div id="streamwrapper.stream-truncate" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">streamWrapper::stream_truncate</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.4.0, PHP 7, PHP 8)</p><p class="refpurpose"><span class="refname">streamWrapper::stream_truncate</span> &mdash; <span class="dc-title">Truncate stream</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-streamwrapper.stream-truncate-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="methodname"><strong>streamWrapper::stream_truncate</strong></span>(<span class="methodparam"><span class="type">int</span> <code class="parameter">$new_size</code></span>): <span class="type">bool</span></div>

  <p class="para rdfs-comment">
   Will respond to truncation, e.g., through <span class="function"><a href="function.ftruncate.html" class="function">ftruncate()</a></span>.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-streamwrapper.stream-truncate-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>
    
     <dt>
<code class="parameter">new_size</code></dt>

     <dd>

      <p class="para">
       The new size.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-streamwrapper.stream-truncate-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>true</code></strong>， 或者在失败时返回 <strong><code>false</code></strong>。
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-streamwrapper.stream-truncate-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.ftruncate.html" class="function" rel="rdfs-seeAlso">ftruncate()</a> - 将文件截断到指定的长度</span></li>
   </ul>
  </p>
 </div>


</div></div></div></body></html>